and high-tech

Steel Strip Hot Galvanizing Line

In its program, Production and Engineering Company ENCE GmbH highlights the most significant metallurgical equipment; this equipment complies with the highest international quality standards and may be offered to customers at competitive prices.


Engineering company ENCE GmbH in partnership with ANDRITZ METALS, Germany SUNDWIG GmbH supplies complex hot galvanizing lines of the cold-rolled steel strip have the annual output ranging from 60 to 500 ths. tons per year.

Technical characteristics of the supplied hot galvanizing lines:
Strip thickness 0.3–2.0 mm
Strip width 600–1650 mm
Coil weight up to 30 tons
Coil external diameter up to 2100 mm
Line speed up to 300 m/min

Coiled steel galvanizing is the most common corrosion protection method. The automated high-speed hot galvanizing lines include the following sections, assemblies, and machines:

  • Input section:
    • Coil rack
    • Loading carriage
    • Dual decoiler system
      • Alternative operation of decoilers, coil weight 10 to 40 t
    • Two thickness gages
      • Designed for initial strip thickness control
    • Dual guillotine shears
      • for cutting the beaded edges of the strip in the alternatively used coils
    • Butt-welding machine
      • Butt-welding machine is equipped with straightener rollers and performs welding of strip ends of two coils; weld thickening no more than 10%, weld strength no less than 85% of the main strip characteristics
    • Looping pit
    • Disc shears
      • Designed for cutting the strip side edges; shearings are cut up by scrap cutter
    • Stretching machine
    • Stretching rollers
    • Multistorey storage loop (accumulator)
      • Automatically monitors the strip stock and has end trolley for constant stretching of the strip.
  • Strip electrochemical cleaning section
    • The strip is cleaned in baths with alkali solution; after that, it is washed and dried in a way similar to that described for the strip pickling line above.
  • Strip hydro-dynamic cleaning section
    • Guide rollers
    • Two vacuum housings
    • Dual rotary blowers
    • Dual high-pressure pumps
    • Two cyclone separators
    • Circulation water treatment system
  • Strip thermal treatment section
    • Strip tensioning regulator
    • Scale-free heating furnace
      • The strip is heated up to 450–470°C to burn the grease residues; this is followed by metal annealing to 730–950°C, depending on the material.
    • Strip jet cooling unit
      • The unit operates under staged accelerated cooling principle and includes the following:
      • Cooling chamber body with lining layer
      • Fan
      • A set of water-cooled tube-type heat exchangers
      • A system of nozzles for jet supply of shielding gas to the strip
      • Shielding gas automatic control system
    • Decay chamber
      • Operates at temperature about 500°C.
  • Strip galvanizing section
    • Inclined channel (section)
    • Filled with shielding gas and protects the heated strip (500°C) from air contact
    • Bottom immersed drum with stellen or ceramic journal bearings
    • Stabilizing roller with journal bearings
    • Correcting roller with journal bearings
    • Noncontact jet device for coating thickness control
    • Electromagnetic strip stabilizer built on air doctor (EM-stabilizer)
    • Bath heating system
    • Removable inducers
    • Gas burners
    • Immersion ceramic heaters
  • Strip cooling section
    • Metal tempering furnace
      • Maintains temperature at 320–350°C
    • Strip air-cooling chamber
    • Galvanizing coat thickness gage
  • Strip straightening and planishing section
    • Strip alignment system
    • Two planishing stands
      • Strip rolling with squeezing 0.5–1.5% which is controlled by induced-pulse sensors and strip tensioning regulators
      • Planishing stands is equipped with zinc removal plant for rolls
    • Stretch straightening machine (machine for straightening by stretching)
    • Passivation bath
  • Exit section:
    • Strip feeding device
    • Vertical storage loop (accumulator)
    • A feeding device with a mechanical side guide
    • Surface quality control system
      • Width control device
      • Penetration defects control
      • Radiation thickness gage
    • Strip electrostatic oiling unit ( strip oiler)
    • Dual tension reel for finished strip (coiler)
    • Strip marking plant
    • Cross-cutting shears for finished strip
    • Overhead crane
    • Tilting cradles for finished coils
    • Finished coils rack